To find focal length of a Concave Mirror
  1.  Read about the Reflection and its Advantage

  2.  Read about the Physics of Reflection

  3.  Read about the http://www.goiit.com/posts/show/813417/geometric-optics-rules-for-image-formation-804244.htm

  4.  Read about the http://www.thealy.com/LCPhysics/notes/spherical_mirrors.htm

  5. Watch a video

 

 

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